<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>


<script>
     var arr =[5,4,6,8,9,7];
     for ( var j = 0;j < arr.length -1;j++){
         for ( var i = 0; i < arr.length -1-j;i++){
             if(arr[i]> arr[i+1]){
                 var temp = arr[i];
                 arr[i] = arr[i+1];
                 arr[i+1] = temp;
             }
         }
     }

    console.log(arr)
</script>
</body>
</html>